[PATCH v3 3/4] mm/page_isolation: remove migratetype from undo_isolate_page_range()

Zi Yan
2025-05-07T21:14:17Z

Since migratetype is no longer overwritten during pageblock isolation,
undoing pageblock isolation no longer needs which migratetype to restore.

Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
---
include/linux/page-isolation.h | 3 +--
mm/memory_hotplug.c | 4 ++--
mm/page_alloc.c | 2 +-
mm/page_isolation.c | 9 +++------
4 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 28c56f423e34..b8b44d3aacd4 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -33,8 +33,7 @@ bool pageblock_unisolate_and_move_free_pages(struct zone *zone, struct page *pag
int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
int migratetype, int flags);

-void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
- int migratetype);
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn);

int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
int isol_flags);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b1caedbade5b..673d41a06da8 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1229,7 +1229,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages,
build_all_zonelists(NULL);

/* Basic onlining is complete, allow allocation of onlined pages. */
- undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE);
+ undo_isolate_page_range(pfn, pfn + nr_pages);

/*
* Freshly onlined pages aren't shuffled (e.g., all pages are placed to
@@ -2115,7 +2115,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages,

failed_removal_isolated:
/* pushback to free area */
- undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
+ undo_isolate_page_range(start_pfn, end_pfn);
memory_notify(MEM_CANCEL_OFFLINE, &arg);
failed_removal_pcplists_disabled:
lru_cache_enable();
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 186d69c9f049..b905ed13c908 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6888,7 +6888,7 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end,
start, end, outer_start, outer_end);
}
done:
- undo_isolate_page_range(start, end, migratetype);
+ undo_isolate_page_range(start, end);
return ret;
}
EXPORT_SYMBOL(alloc_contig_range_noprof);
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 08f627a5032f..1edfef408faf 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -515,7 +515,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
page = __first_valid_page(pfn, pageblock_nr_pages);
if (page && set_migratetype_isolate(page, migratetype, flags,
start_pfn, end_pfn)) {
- undo_isolate_page_range(isolate_start, pfn, migratetype);
+ undo_isolate_page_range(isolate_start, pfn);
unset_migratetype_isolate(
pfn_to_page(isolate_end - pageblock_nr_pages));
return -EBUSY;
@@ -528,13 +528,10 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
* undo_isolate_page_range - undo effects of start_isolate_page_range()
* @start_pfn: The first PFN of the isolated range
* @end_pfn: The last PFN of the isolated range
- * @migratetype: New migrate type to set on the range
*
- * This finds every MIGRATE_ISOLATE page block in the given range
- * and switches it to @migratetype.
+ * This finds and unsets every MIGRATE_ISOLATE page block in the given range
*/
-void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
- int migratetype)
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long pfn;
struct page *page;
--
2.47.2